What is the requirement for nutrient management in organic farming?

•             Biodegradable material of microbial, plant or animal origin produced on organic farms can be used as source of nutrient. •             Non synthetic mineral fertilisers and brought-in bio fertilisers (biological origin) shall be regarded as supplementary. •             Mineral fertilizers shall only be used in a supplementary role  to carbon based materials. Mineral fertilisers shall be applied in their natural composition  and shall not be rendered more soluble by chemical treatment. •             Manures containing human excreta (faeces and urine) are prohibited.